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(CT/P-09) Pellet Injection as a Possible Tool for Plasma Performance Improvement

A.R. Polevoi1), M. Sugihara1), H. Takenaga2), A. Isayama2), N. Oyama2), A. Loarte3), G. Saibene3), G.V. Pereverzev4)
1) ITER IT, ITER Naka JWS, Naka-Machi, Naka-Gun, Ibaraki, Japan 2) Japan Atomic Energy Research Institute, Naka Establishment, Mukouyama, Naka-machi, Naka-gun, Ibaraki-ken, Japan
3) EFDA, Max-Plank-Institut fur Plasmaphysik, Garching bei München, Germany

Abstract.  The possibility of plasma performance improvement in the ITER reference 15 MA scenario by pellet injection is considered. Fusion gain Q increasing by density peaking and controllable mitigation of the energy loss in the Type-I Edge Localised Modes (ELMs) by increase of the pedestal collisionality are analysed. Plasma scenario with Q = 20 within the Greenwald density limit is demonstrated. Requirements for pellet injection for the ELM loss reduction below 5% of the pedestal energy is considered.

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IAEA 2003